#import"ViewController.h"
#import"NSString+category.h"
@interfaceViewController ()
@property(strong,nonatomic)UITextField* textfield;
@end
#define kMaxNumber15
@implementationViewController
- (UITextField*)textfield{
if(!_textfield)
{
_textfield= [[UITextFieldalloc]initWithFrame:CGRectMake(10,100,200,40)];
_textfield.delegate=self;
_textfield.placeholder=@"请输入";
_textfield.returnKeyType=UIReturnKeyDone;
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(textFiledDidChange:)
name:@"UITextFieldTextDidChangeNotification"
object:_textfield];
}
return_textfield;
}
- (void)viewDidLoad {
[superviewDidLoad];
self.view.backgroundColor= [UIColorgrayColor];
[self.viewaddSubview:self.textfield];
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string
{
NSLog(@"打印信息:%lu-----%lu ",(unsignedlong)range.location,(unsignedlong)range.length);
NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string];
if(toBeString.length > kMaxNumber && range.length!=1){
textField.text = [toBeString substringToIndex:kMaxNumber];
returnNO;
}
returnYES;
}
- (void)textFiledDidChange:(NSNotification*)sender
{
UITextField *textField = (UITextField *)sender.object;
NSString *toBeString = textField.text;
NSString *lang = [[textField textInputMode] primaryLanguage];//键盘输入模式
if([lang isEqualToString:@"zh-Hans"]) {//简体中文输入，包括简体拼音，健体五笔，简体手写
UITextRange *selectedRange = [textField markedTextRange];
//获取高亮部分
UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0];
//没有高亮选择的字，则对已输入的文字进行字数统计和限制
if(!position) {
if(toBeString.length > kMaxNumber) {
textField.text = [toBeString substringToIndex:kMaxNumber];
}
}
//有高亮选择的字符串，则暂不对文字进行统计和限制
else{
}
}
//中文输入法以外的直接对其统计限制即可，不考虑其他语种情况
else{
if(toBeString.length > kMaxNumber) {
textField.text = [toBeString substringToIndex:kMaxNumber];
}
}
}
//- (int)convertToInt:(NSString*)strtemp
//{
//int strlength = 0;
//char* p = (char*)[strtemp cStringUsingEncoding:NSUnicodeStringEncoding];
//for (int i=0 ; i<[strtemp lengthOfBytesUsingEncoding:NSUnicodeStringEncoding] ;i++) {
//if (*p) {
//p++;
//strlength++;
//}
//else {
//p++;
//}
//
//}
//return strlength;
//}
#pragma mark - UITextFieldDelegate
- (BOOL)textFieldShouldReturn:(UITextField*)textField {
[textFieldresignFirstResponder];
returnYES;
}
-(void)dealloc{
[[NSNotificationCenter defaultCenter]removeObserver:self
name:@"UITextFieldTextDidChangeNotification"
object:self.textfield];
}
- (void)didReceiveMemoryWarning {
[superdidReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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